Write ps1 script to download data

Taskfile.yml

@@ -41,8 +41,8 @@ tasks:
   setup-win:
     platforms: [ windows ]
     cmds:
-      - powershell -Command "Invoke-WebRequest 'https://drive.google.com/uc?export=download&id=1I-hwc0RHoQqW774gbS5qR-GHa1E7BlsS' -OutFile {{.DATA_DIR}}/sena-3.zip -Resume"
-      - powershell -Command "Invoke-WebRequest 'https://drive.usercontent.google.com/download?export=download&id=1Jk-eSDho8ATBMS-Kmfatwi-MWQth26ro&confirm=t' -OutFile {{.DATA_DIR}}/elawa.zip -Resume"
+      - powershell -File download.ps1 sena-3 'https://drive.google.com/uc?export=download&id=1I-hwc0RHoQqW774gbS5qR-GHa1E7BlsS' 'BEC5131799DB07BF8D84D8FC1F3169FB2574F2A1F4C37F6898EAB563A4AE95B8'
+      - powershell -File download.ps1 elawa 'https://drive.usercontent.google.com/download?export=download&id=1Jk-eSDho8ATBMS-Kmfatwi-MWQth26ro&confirm=t' "E3608F1E3188CE5FDB166FBF9D5AAD06558DB68EFA079FB453881572B50CB8E3"
   setup-unix:
     platforms: [ linux, darwin ]
     cmds:

download.ps1

@@ -0,0 +1,51 @@
+param (
+    [Parameter(Mandatory=$true)]
+    [string]$FileName,
+
+    [Parameter(Mandatory=$true)]
+    [string]$Url,
+
+    [Parameter(Mandatory=$true)]
+    [string]$Checksum
+)
+
+$DataDir = "./data"
+$FilePath = "$DataDir\$FileName.zip"
+
+function Get-Checksum {
+    param (
+        [string]$FilePath
+    )
+    $hash = Get-FileHash -Path $FilePath -Algorithm SHA256
+    return $hash.Hash
+}
+
+function Get-File {
+  param (
+      [string]$FileName,
+      [string]$FileUrl,
+      [string]$ExpectedChecksum,
+      [string]$FilePath
+  )
+
+  Write-Host("Trying to download $FileName data...")
+
+  if (Test-Path -Path $FilePath) {
+      $checksum = Get-Checksum -FilePath $FilePath
+      if ($checksum -eq $ExpectedChecksum) {
+          # Checksum matches. No need to re-download.
+          Write-Output "$FileName already exists."
+      } else {
+          Write-Output "Checksum does not match. Re-downloading $FileName..."
+          Invoke-WebRequest -Uri $FileUrl -OutFile $FilePath
+      }
+  } else {
+      Write-Output "$FileName does not exist. Downloading..."
+      Invoke-WebRequest -Uri $FileUrl -OutFile $FilePath
+  }
+}
+
+Get-File -FileName $FileName `
+                     -FileUrl $Url `
+                     -ExpectedChecksum $Checksum `
+                     -FilePath $FilePath